com.espertech.esper.epl.expression.funcs
Class ExprCastNode

java.lang.Object
  com.espertech.esper.epl.expression.core.ExprNodeBase
      com.espertech.esper.epl.expression.funcs.ExprCastNode

All Implemented Interfaces:

ExprNode, ExprValidator, MetaDefItem, java.io.Serializable

public class ExprCastNode
extends ExprNodeBase

Represents the CAST(expression, type) function is an expression tree.

See Also:

Serialized Form

Nested Class Summary

static interface	ExprCastNode.CasterParserComputer Casting and parsing computer.
static class	ExprCastNode.NonnumericCasterComputer Casting and parsing computer.
static class	ExprCastNode.NumberCasterComputer Casting and parsing computer.
static class	ExprCastNode.StringParserComputer Casting and parsing computer.
static class	ExprCastNode.StringToCalendarWDynamicFormatComputer
static class	ExprCastNode.StringToCalendarWStaticFormatComputer
static class	ExprCastNode.StringToCalendarWStaticISOFormatComputer
static class	ExprCastNode.StringToDateLongWDynamicFormat
static class	ExprCastNode.StringToDateLongWStaticFormat
static class	ExprCastNode.StringToDateWDynamicFormatComputer
static class	ExprCastNode.StringToDateWStaticFormatComputer
static class	ExprCastNode.StringToDateWStaticISOFormatComputer
static class	ExprCastNode.StringToLongWDynamicFormatComputer
static class	ExprCastNode.StringToLongWStaticFormatComputer
static class	ExprCastNode.StringToLongWStaticISOFormatComputer
static class	ExprCastNode.StringXFormComputer Casting and parsing computer.

Constructor Summary

ExprCastNode(java.lang.String classIdentifier)
Ctor.

Method Summary

boolean	equalsNode(ExprNode node) Return true if a expression node semantically equals the current node, or false if not.
java.lang.String	getClassIdentifier() Returns the name of the type of cast to.
ExprEvaluator	getExprEvaluator()
ExprPrecedenceEnum	getPrecedence() Returns precedence.
java.lang.Class	getTargetType()
static EPException	handleParseException(java.lang.String formatString, java.lang.String date, java.text.ParseException ex)
static EPException	handleParseISOException(java.lang.String date, ScheduleParameterException ex)
boolean	isConstantResult() Returns true if the expression node's evaluation value doesn't depend on any events data, as must be determined at validation time, which is bottom-up and therefore reliably allows each node to determine constant value.
void	toPrecedenceFreeEPL(java.io.StringWriter writer)
ExprNode	validate(ExprValidationContext validationContext)

Methods inherited from class com.espertech.esper.epl.expression.core.ExprNodeBase

accept, accept, acceptChildnodes, addChildNode, addChildNodes, addChildNodeToFront, getChildNodes, replaceUnlistedChildNode, setChildNode, setChildNodes, toEPL

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ExprCastNode

public ExprCastNode(java.lang.String classIdentifier)

Ctor.

Parameters:

classIdentifier - the the name of the type to cast to

Method Detail

getExprEvaluator

public ExprEvaluator getExprEvaluator()

getClassIdentifier

public java.lang.String getClassIdentifier()

Returns the name of the type of cast to.

Returns:

type name

validate

public ExprNode validate(ExprValidationContext validationContext)
                  throws ExprValidationException

Throws:

ExprValidationException

isConstantResult

public boolean isConstantResult()

Description copied from interface: ExprNode

Returns true if the expression node's evaluation value doesn't depend on any events data, as must be determined at validation time, which is bottom-up and therefore reliably allows each node to determine constant value.

Returns:

true for constant evaluation value, false for non-constant evaluation value

getTargetType

public java.lang.Class getTargetType()

toPrecedenceFreeEPL

public void toPrecedenceFreeEPL(java.io.StringWriter writer)

Specified by:

toPrecedenceFreeEPL in class ExprNodeBase

getPrecedence

public ExprPrecedenceEnum getPrecedence()

Description copied from interface: ExprNode

Returns precedence.

Returns:

precedence

equalsNode

public boolean equalsNode(ExprNode node)

Description copied from interface: ExprNode

Return true if a expression node semantically equals the current node, or false if not.

Concrete implementations should compare the type and any additional information that impact the evaluation of a node.

Parameters:

node - to compare to

Returns:

true if semantically equal, or false if not equals

handleParseException

public static EPException handleParseException(java.lang.String formatString,
                                               java.lang.String date,
                                               java.text.ParseException ex)

handleParseISOException

public static EPException handleParseISOException(java.lang.String date,
                                                  ScheduleParameterException ex)